835 Denial Combination

CO-16+N290

CO

Contractual Obligation · Claim-Level Adjustment

Missing Information

What This Combination Means

The claim was denied because the rendering provider's primary identifier (typically the NPI) is missing, incomplete, or invalid in the claim submission. This is a contractual obligation adjustment indicating the provider must write off the amount due to submitting a claim that fails to meet basic data completeness requirements under the provider's contract with the payer.

Financial Responsibility

provider writeoff

The provider must write off this amount as a contractual obligation. The patient cannot be billed because the denial resulted from the provider's failure to submit complete and accurate rendering provider identification information.

N/A

Appeal Success

7-14 days (corrected claim cycle)

Avg. Resolution

Medium

Difficulty

No

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-16+N290 combination — not generic advice.

Not Appealable:This is a CO adjustment for a correctable submission error; the proper remedy is submitting a corrected claim with the valid rendering provider identifier rather than appealing.
  1. 1

    Locate the original claim and identify the rendering provider field (Loop 2310B, NM109 in 837 format)

    The N290 remark specifically flags the rendering provider primary identifier, which is typically the rendering provider NPI in position 2310B

  2. 2

    Verify the correct rendering provider NPI in NPPES registry and ensure it is active and matches the actual rendering provider

    Common errors include using billing provider NPI instead of rendering provider NPI, transposed digits, or inactive NPIs

  3. 3

    Submit a corrected claim with the accurate rendering provider NPI in the appropriate field and claim frequency code 7

    The corrected claim replaces the original and must include all original information plus the corrected rendering provider identifier to resolve the CO-16+N290 denial

Specialty Context

How CO-16+N290 typically presents across different practice types.

Dental

Ensure the rendering dentist's NPI is correctly reported in the rendering provider field, separate from the billing entity NPI; common in group practices where multiple dentists render services

Medical

Critical for facility-based services where rendering physician NPI must be distinguished from facility NPI; affects professional component claims and incident-to services where rendering provider identification is mandatory

Behavioral Health

Rendering therapist, counselor, or psychiatrist NPI must be present and valid even when billing under group practice; important for claims where supervision requirements or credentialing status of the individual provider affects payment

Individual Code References

View the standalone definition for each code in this combination.

CARC 16RARC N290

Medicare Contractor Guidance for CARC 16

FCSO + Noridian + uhc + aetna + bcbs_az

This RUC is received when a claim is submitted with missing, incorrect, or invalid information. For details pertaining to your claim, please refer to the remittance advice remark codes (RARCs) on the remittance advice (RA).

How to Prevent CARC 16 Denials

  • ✓

    Review the RARC on the remittance advice to identify which specific field has the error.

  • ✓

    Per Medicare guidelines, claims must be filed no later than 12 months after the date of service. RUCs are not considered filed/submitted.

CMS guidelines for completion of form CMS-1500 in the Medicare Claims Processing Manual (100-04), Chapter 26SPOTFee Schedule Lookup ToolCMS laboratory demographics lookupModifier lookup toolNoridian Medicare PortalNMPIVRSame or SimilarPECOSPDAC

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Synthesized from official definitions — not from training data

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